we are in the Jura, and Avoriaz is the French side of Portes du Soleil. So yes, and no. I used to take ski trips for students, friends and family to the Swiss side of Portes du Soleil, and we used to ski over the French side, Chapelle d'Abondance, Châtel and yes, over to Avoriaz- with the challenging return via the huge bumps' fields of Pas de Chavanette!
I know that area very well- and it is lovey in Summer too. Will probably be over there, but in Champéry, on Swiss side, for OH's 75th. My 70th is booked in another resort in the 4Vallées- ski in, ski out, with spa. We have smaller resorts here on both French and Swiss side- but are probably more famous for cross country skiing- half way on the GTJ- Grande Traversée du Jura. Our local French resort is Métabief/Mt d'Or if you want to Google it.
The Portes du Soleil access if about 1.30 mins from here.